Process for the manufacture of watersoluble salts of sulphuric acid esters of leuco vat dyestuffs of the anthraquinone series



United States Patent PROCESS FOR THE MANUFACTURE OF WATER- SOLUBLE SALTS OF SULPHURIC ACID ESTERS OF LEUCO VAT DYESTUFFS OF THE ANTHRA- QUINONE SERIES Walter Oppliger and Eduard Peyer, Basel, and Hans Schenkel, Neue Welt, near Basel, and Karl Glenz, Binningen, near Basel, Switzerland, assignors to Durand & Huguenin A.G., Basel, Switzerland, a Swiss firm No Drawing. Application October 22, 1956 Serial No. 617,237

Claims priority, application Switzerland October 25, 1955 7 Claims. (Cl. 260-316) It is known that vat dyestuifs can be converted into the sulphuric acid ester salts of their leuco derivative by treating the vat dyestuffs with substances yielding sulphur trioxide or with sulphur trioxide itself and with metals in the presence of tertiary bases (see British Patents Nos. 247,787 and 25l,49l). These processes can also be carried out in the presence of diluents, preferably those which do not participate in the reaction, such as for instance acetone and nitrobenzene (cf. British Patent No. 278,399). Various tertiary bases such as pyridine, quinoline and dimethylaniline have been proposed for carrying out this reaction; in practice, however, only pyridine and certain homologues thereof are suitable.

It is also known that these processes, when applied to a large number of vat dyestuffs of the anthraquinone series, lead to poor yields and often only traces of the leuco sulphuric acid ester salts are obtained. In some instances, even though water-soluble products are obtained, they cannot be reconverted or can only be partially reconverted on the fiber into the original vat dye stuff by the methods known for applying ester salts, the leuco vat dyestuffs thus being of no use. It is also known that the ketoenol equilibrium of vat dyestufis of the anthraquinone series is substantially shifted towards the enol compound by means of strong alkalis (Joachim Miiller, Melliand, 1947, pages 95 and 136).

It has now been found that vat dyestuffs of the anthraquinone series, which are difiicult to esterify, can be converted into their water-soluble leuco sulphuric acid ester salts.

The main object of the present invention thus provides a new method for the manufacture of a water-soluble salt of a sulphuric acid ester of a leuco vat dyestuif of the anthraquinone series, which dyestuff gives an ester yield of less than 25% relative to the weight thereof when esterified by means of a mixture of pyridine base and chlorosulphonic acid (10:1 by weight) in the presence of a metal powder, the new method comprising reacting the vat dyestuffs in the presence of at least one finely divided metal, selected from the group consisting of iron, cobalt, zinc, copper and copper alloys with a member of the group consisting of chlorosulphonic acid and an equivalent mixture of sulphur trioxide and hydrogen chloride in the presence of a mixture consisting of at least one pyridine base selected from the group consisting of pyridine, w, [3- and 'y-picoline, 2:4- and 2:6- lutidine, Z-methyl-S-ethyl-pyridine, and of at least one tertiary amine of the general formula in which all the four free valences are occupied by carbon atoms of radicals selectedfrom the group consisting of monovalent saturated hydrocarbon radicals each occu- Patented Dec. 22, 1959 ICC pying any one of the said free valences and of divalent saturated hydrocarbon radicals having two end carbon atoms occupying any one pair of the said free valences, any of the said monovalent and divalent saturated hydrocarbon radicals which are bound solely to the nitrogen atom each containing at most seven carbon atoms and any two monovalent radicals so bound containing together at least three and at most eleven carbon atoms, any of the said monovalent and divalent saturated hydrocarbon radicals which are bound solely to the carbon atom of the formula each containing at most six carbon atoms and any two monovalent radicals so bound containing together at least two and at most eight carbon atoms, the said pyridine base-tertiary amine mixture containing 10-60 percent by weight of tertiary amine component, and subsequently converting the resulting sulphuric acid ester compound into a water-soluble ester salt.

According to a preferred embodiment of this invention the said pyridine base-tertiary amine mixture contains 15 to 35 percent by weight of the tertiary amine component.

Among the tertiary amines defined above there may be mentioned, more especially, those of the following general formulae:

\Hifi R2 R3 in which R R and R represent methyl, ethyl, propyl or butyl groups, and R represents an ethyl, propyl, isopropyl or butyl group. The use of amines of the above formula is illustrated in Examples 7 to 14 and Table I.

(II) R4 (IV) R in which X represents a pentamethylene group which may be substituted by methyl, R represents a methyl, ethyl, propyl or butyl group, and R represents an ethyl, propyl, isopropyl, butyl or cyclohexyl group. The use of amines of the above formula is illustrated in Examples 1 to 6 and 28 to 41 and Table IV.

in which X and Y represent pentamethylene or tetramethylene groups which may be substituted by methyl. The use of amines of the above formula is illustrated in Examples 42 to 48 and Table V.

As vat dyestuffs of the anthraquinone series which are difficult to esterify there are to be understood those of which the sulphuric acid ester salts can be obtained by the usual methods of esterification only in small yields, that is to say, yields which are insutficient for commercial purposes or are trace-like, or in the form of products which cannot be converted or can be converted only partially into the original dyestuff by the usual method of application. For the purposes of the present invention, the anthraquinone vat dyestuffs in question are those which are difficult to esterify as determined by the test given in British specification No. 719 621. Vat dyestuffs of the anthraquinone series which are difficult to esterify are found, for example, in the following classes:

(1) 1-aroylaminoanthraquinones which contain as a substituent in the 4-, 5- or 8-position an acylamino or alkoxy group or halogen atom, and especially diaroylaminoanthraquinones and their derivatives containing substituents in the benzene nuclei.

(2) Anthraquinone-carbazoles.

(3) Anthrimides.

The chlorosulphonic acid may be introduced into the reaction mixture as such or partially or completely in the form of an equivalent mixture of sulphur trioxide and hydrogen chloride or in the form of a sulphur trioxide addition product and a hydrochloride of one or both of the bases used.

The pyridine bases may be used either in the pure form or in the form of a commercial product.

Similarly the tertiary amines defined above may be used in the pure form or in the form of a commercial product, and, as stated above, two or more of them may be used.

The use of a mixture of at least one pyridine base and at least one tertiary amine containing the atomic grouping in suitable relative proportions is of critical importance in the present process. Thus, in order to obtain commercially valuable results it is essential that the proportion of the said tertiary amine or amines in the mixture of organic bases should be at least 10 and at most 60 percent on the weight of the mixture. In order to obtain an optimum yield of sulphuric acid ester salt, the proportion of the tertiary amine or amines must be chosen within the aforesaid proportions depending on the behaviour of the particular vat dyestuif used.

In carrying out the process it is not essential to use from the outset a mixture of a pyridine base and one or more of the said tertiary amines, so that for example, one of the components of the mixture of bases may be reacted with chlorosulphonic acid and then mixed with a-suitable quantity of the other component. It is essential only that, before the commencement of the esterification reaction, the two bases should be present in suitable relative proportions. It will be understood that for the esterification it is neecssary to use at least two molecular proportions of chlorosulphonic acid for each anthraquinone nucleus present in the vat dyestuff.

The proportion of the mixture of organic bases must be such as to provide at least 1.4 molecular proportions of the said tertiary amine or amines for every two molecular proportions of chlorosulphonic acid used, except that if less than four molecular proportions of the acid are used not less than two molecular proportions of the said amine should be present for every two molecular proportions of the acid. However, in order to obtain optimum results, it will usually be necessary to use a proportion of chlorosulphonic acid, and correspondingly of the basic mixture several times greater than the minimum proportions mentioned above. The most favourable excess to use depends on the properties of the particular dyestuff to be esterified, and can easily be determined by preliminary tests.

In the present process there is used as the metal finely divided iron, cobalt, zinc, copper or a copper alloy. By the expression finely divided there is to be understood, for example, the powdered form hitherto used,-

and preferably a fineness such that the metal passes through a 150-200 mesh sieve (see Handbook of Chemistry and Physics, 31st edition, page 2669). The proportion of the metal should be at least 1.5, and preferably at least 2, atomic proportions for each anthraquinone nucleus present in the vat dyestuff. However, it will usually be of advantage to use a proportion considerably in excess of the minimum proportion.

In one form of the process the reaction is carried out in the presence of not only one of the said metals, but in the presence of a plurality of these metals. It is of special advantage from the practical point of view to use iron, owing to its low cost.

The process may, if desired, be carried out with the exclusion of oxygen. The metal may be subjected to an etching treatment prior to the esterification process and in the absence of the vat dyestuff to be esterified. Such etching treatment may be carried out as described in British specification Nos. 745,088 and 745,365.

The sulphuric acid ester compound resulting from the esterification is converted into a water-soluble ester salt by a method in itself known, for example, by treatment with a suitable base or by any other conventional method. Especially suitable water-soluble sulphuric acid ester salts are the lithium, sodium, potassium, ammonium and hydroxyalkylamine salts.

The following examples illustrate the invention, the parts being by weight:

EXAMPLE 1 A mixture of 150 parts of commercial a-picoline boiling at 125-l28 C. and 55 parts of diethly-cyclohexylamine is mixed, while stirring and cooling, with 20 parts of sulphonic acid, 20 parts of finely ground and dry 1-(4'- dimethylsulphamidobenzoylamino)-4-benzoylaminoanthraquinone as well as 15 parts of copper powder are then added, and the whole is heated for 4 hours at 50 C. while stirring. The reaction mixture may be worked up as follows: It 'is introduced into 1500 parts of a sodium carbonate solution of 4% strength and the mixture of bases is distilled ofi under reduced pressure at 50 C. After removing the bases, the clear solution is decanted from the precipitated oil, the oil is dissolved in 200 parts of ethyl alcohol and stirred with 15 parts of sodium hydroxide solution of 30% strength and 500 parts of water for 30 minutes at 35 C. The sulphuric acid ester of 1-(4-dimethy1sulphamidobenzoylamino)-4-benzoylaminoanthraquinone is recovered from the solution, which re mains'after filtering off the copper residue, directly or after removal of the alcohol by distillation under reduced pressure at 35 C. in the form of its sodium salt by salting out with sodium chloride. The pale yellow crystalline sulphuric acid ester salt is easily soluble in water and yields the original dyestufi' when subjected to oxidative splitting The yield of sulphuric acid ester salt amounts to 30%. When applied to textiles by known methods it yields red tints.

If in this example the copper powder is replaced by the same quantity of brass powder, the sulphuric acid ester salt is obtained in a yield of at least EXAMPLE 2 20 parts of chlorosulphonic acid are introduced into a mixture of 178 parts of u-picoline and 42 parts of diethylcyclohexylamine while cooling and stirring and replacing the oxygen present over the reaction mass by a nitrogen atmosphere, whereupon 10 parts of 1:5-dibenzoylaminoanthraquinone and 7 parts of brass powder are added. The suspension is heated for 4 hours at 55 C. while stirring, and then the reaction mixture is poured into a solution of 42 parts of sodium carbonate in 1500 parts of water. The product is worked up in a manner analogous to that described in Example 1. sulphuric acid ester salt is 85 percent.

if the reaction mass is agitated in a suitable way, i.e.

The yield of the.

in such a way that substantially no oxygen is introduced intothe reaction mass, the reaction may take place without replacing the air present in the reaction vessel by a nitrogen atmosphere.

When applied to textiles the product yields gold-yellow tints which are distinguished by pronounced properties of wet fastness.

Practically the same yield is obtained by using, instead of 1:5 -dibenzoylaminoanthraquinone, l-(2'-methylbenzoylamino) -benzoylaminoanthraquinone, 1:5-di-(2'- methylbenzoylamino)-anthaquinone, l:5-di-(2':4-dichlorobenzoyl)-aminoanthraquinone or the vat dyestuff prepared as described in the first paragraph of Example 1 of French Patent No. 908,768.

EXAMPLE 3 20 parts of chlorosulphonic acid are added to a mixture of 160 parts of u-picoline and 40 parts of diethylcyclohexylamine while stirring and cooling. parts of carbazolized di-(5-benzoylamino-1'-anthraquinonyl -2 8- diamino-chrysene and 7 parts of brass powder are then introduced and the whole is heated for 5 hours at 50 C. The reaction mixture is then poured into 1500 parts of water, which contains 40 parts of sodium carbonate, and the mixture of bases is distilled ofi at 50 C. The prod net is worked up in a manner analogous to that described in Example 1. The yield of the sulphuric acid ester salt is 83 percent.

Instead of carbazolized di-(5'-benzoylamino-1'-anthraquinonyl)-2:S-diaminochrysene, there may be used carbazolized 8' 8"-dibenzoylamino-1 :4: 1: l-trianthrimide, the carbazolized vat dyestufl prepared as described in Example 5 of French Patent No. 839,529, the carbazolized vat dyestuff obtained as described in Example 9 of French Patent No. 843,140 of the vat dyestuff No. 39, on page 514 in volume 65 of the Journal of the Society of Dyers and Colorists.

EXAMPLE 4 30 parts of chlorosulphonic acid and 60 parts of diethylcyclohexylamine are introduced, while cooling and stirring, into 240 parts of commercial or-picoline boiling at 125-128 C. After the addition of 20 parts of iron powder and parts of l:S-dibenzoylaminoanthraquinone, the mixture is heated for 5-6 hours at 55 C., while stirring. The reaction mixture may be worked up as follows:

The mixture is introduced into a solution of 53 parts of calcined sodium carbonate in 450 parts of water, and the mixture of bases is distilled off under reduced pressure at 50 C. The aqueous solution is decanted from the precipitated oil, the oil is dissolved in 150 parts of alcohol and stirred with 30 parts of sodium hydroxide solution of 30 percent strength and 370 parts of water for 30 minutes at 35 C. After filtering the solution to remove the iron residue therefrom, the sulphuric acid ester salt of leuco-l :5-dibenzoylaminoanthraquinone can be recovered by salting out with sodium chloride in a yield of 80-90 percent.

Instead of parts of iron powder, there may be used 20 parts of a mixture of 15 parts of iron powder and 5 parts of cobalt powder.

Furthermore, instead of 20 parts of iron powder there may be used 20 parts of a mixture of 10 parts of iron powder and 10 parts of brass powder.

EXAMPLE 5 The reaction mixture is introduced into 1500 parts of 6. a sodium carbonate solution of 4 percent strength and the mixture of bases is distilled off under reduced pressure at 50 C. The aqueous solution is decanted from the precipitated oil, the oil is dissolved in parts of alcohol and stirred with 30 parts of sodium hydroxide solution of 30 percent strength and 370 parts of water for 30 minutes at 35 C. The solution is filtered to remove the residues of brass, and the sulphuric acid ester of leuco l:5-dibenzoylaminoanthraquinone can be recovered by salting out with sodium chloride in a yield of 30-90 percent.

When the resulting sulphuric acid ester salt is applied to textiles gold-yellow tints are obtained, which are distinguished by excellent properties of wet fatness.

Instead of 7 parts of brass powder, there may be used 7 parts of copper powder, 10 parts of iron powder or 10 parts of a mixture of 5 parts of brass powder and 5 parts of iron powder.

Furthermore, instead of 45 parts of diethyl-(Z-methylcyclohexyl)-amine, there may be used 45 parts of diethyl- (3-methylcyclohexyl)-amine, 45 parts of diethyl-(4-methylcyclohexyD-amine, 45 parts of a mixture of these diethyl-(monomcthylcyclohexyl)-amines or 45 parts of a mixture of diethylcyclohexylamineand diethyl-(monomethylcyclohexyl)-amine (for instance 1:44; 22.52225 or 44:1).

EXAMPLE 6 Into parts of technical 2-methy'i-5-ethylpyridine, B.P. l76-l78 C., are subsequently introduced, while cooling and stirring, 20 parts of chlorosulphonic acid, 25 parts of iron powder and 56 parts of diethylcyclohexylamine. After addition of 10 parts of lz5-dibenzoylaminoanthraquinone the Whole mixture is heated for 5 to 6 hours at 67-69 C., while stirring.

The reaction mixture can be worked up in the following way:

It is introduced into a solution of 35.5 parts of calcined sodium carbonate in 600 parts of water and the mixture of bases is distilled off at a bath temperature of 50 C. under reduced pressure. The aqueous solution is decanted from the separated oil, the oil being then dissolved in 100 parts of alcohol and stirred for 30 minutes at 40 C. with 20 parts of a 30% sodium hydroxide solution and 250 parts of water. After having freed the solution by filtration from iron residues and after having concentrated the solution under reduced pressure at a temperature of 50 C. the sulphuric acid ester of leuco 1:5-dibenzoylaminoanthraquinone can be recovered by s lting out with sodium chloride in a yield of more than 90 percent.

If in the above example the quantity of 2-methyl-5- ethyl-pyridine is increased from 160 parts to 224 parts, the reaction procedure being otherwise the same as in this example, one also obtains the sulphuric acid ester of leuco 1:5-dibenzoylaminoanthraquinone in a good yield.

EXAMPLE 7 20 parts of chlorosulphonic acid are introduced, while cooling and stirring, into l60 parts of a-picoline. After the addition of 25 parts of iron powder the Whole is stirred for 15 minutes at 18-20 C. 41.5 parts of diethylisopropylamine and then 10 parts of 1:5-dibenzoylamin0- anthraquinone are added while cooling. The whole is heated at 55-57 C. until the dyestutf disappears, which takes about 5 hours. The reaction mixture is worked up as follows.

It is introduced into a solution of 36 parts of sodium carbonate in 600 parts of water, and the bases are distilled off under reduced pressure at a bath temperature of 4-0-45" C.

The sodium salt of the sulphuric acid ester of leuco- 1:5-dibenzoylaminoanthraquinone is obtained in a yield of 83 percent by adding sodium chloride to the filtered solution.

The same results can be obtained by using, instead of 25 parts of iron powder, 10 parts of copper powder or 10 parts of brass powder.

EXAMPLE 8 10 parts of chlorosulphonic acid are introduced into 189 parts of a-picoline, While cooling and stirring. After the addition of 8 parts of brass powder, the whole is stirred for 15 minutes at 1820 C., and then 21 parts of diethyl-isopropylamine and subsequently parts of 1:S-dibenzoylamino-anthraquinone are added, while cooling. The whole is heated at 5557 C. until the dyestuff disappears, which takes about 5 hours. The reaction mixture is worked up as follows:

It is introduced into a solution of 18 parts of sodium carbonate in 500 parts of water and the bases are distilled off under reduced pressure at a bath temperature of 404S C. The precipitated diethyl-isopropylamine salt of the sulphuric acid ester of the leuco vat dyestufi? is separated and stirred for 40 minutes in a solution of 3 parts of sodium hydroxide in 12 parts of water and 50 parts of alcohol at 40 C. The solution is filtered and concentrated by evaporation, and by the addition of sodium chloride the sodium salt of the sulphuric acid ester of leuco-1:5-dibenzoylaminoanthraquinone is obtained in a yield of 78 percent.

EXAMPLE 9 parts of chlorosulphonic acid are introduced into 80 p rts of 'y-picoline. while cooling and stirring. After the addition of 7.5 parts of brass powder, the whole is stirred for 30 minutes at 18-20 C. and then 23.2 parts of ethyl-diisopropylamine and subsequently 5 parts of 1:4 dibenzovlamino anthraquinone are added. The whole is heated to 40-45 C. until the dyestufi has disappeared, which takes about 30 minutes. By working up the mixture as described in Example 8 the sodium salt of the sulphuric acid ester of leuco 1:4-dibenzoylaminoanthraquinone is obtained in a yield of 76 percent.

EXAMPLE 10 10 parts of chlorosulphonic acid are added to 80 parts of 2:6-lutidine, While cooling and stirring. After the addition of 8 parts of copper powder the whole is stirred for 30 minutes at -2() C. and then 23.2 parts of ethyldiisopropylarnine and subsequently 5 parts of 1:4-dibenzoylamineo-anthraquinone are added while cooling. The whole is heated to 5557 C. until the dyestuff disappears, which takes about 4 hours.

By working up as described in Example 8, there is obtained the sodium salt of the sulphuric acid ester of leuco-l:4-dibenzoylaminoanthraquinone in a yield of 90 percent.

By using, instead of the copper powder, 75 parts of brass powder, and, instead of 2:6-lutidine, 80 parts of 2- methyl-S-ethyl-pyridine, and otherwise working in the manner described above, there is obtained the sodium salt of the sulphuric acid ester of leuco-1:4-dibenzoylaminoanthraquinone in a yield of 84 percent.

EXAMPLE 11 10 parts of chlorosulphonic acid are added to 80 parts of 2-rnethyl-5-ethylpyridine, while stirring and cooling. After the addition of 7.5 parts of brass powder, the whole is stirred for 30 minutes at l8-20 C., and then 26 parts of diethyl-3-amylamine and subsequently 5 parts of 1:4- dibenzoylaminoanthraquinone are added, while cooling. The whole is heated at 4045 C. until the dyestuff disappears, which takes about /2 hour.

By Working up as described in Example 8 there is obtained the sodium salt of the sulphuric ester of leuco-1:4- dibenzoylaminoanthraquinone in a yield of 82 percent.

By using in this example, instead of diethyl-3-arnylamine, 33 parts of diethyl-4-heptylamine or 36 parts of diethyl-S-nonylamine, the sodium salt of the sulphuric acid ester of leuco-1 :4-dibenzoylaminoanthraquinone is obtained in a yield of 87 percent or percent, respectively.

EXAMPLE 12 42 parts of diethyl-isopropylamine and subsequently 20 parts of chlorosulphonic acid are introduced into 48 parts of a-picoline while cooling and stirring. There are also added 15 parts of copper powder and 10 parts of l- (4 dimethylsulphonamido benzoylamino) 4 (4"- chlorobenzoylamino')-anthraquinone (see the first paragraph of Example 1 of British specification No. 636,691) are added, and the whole is heated at 5557 C. until the dyestuff disappears, while takes about 1% hours. The reaction mixture is introduced into a solution of 36 parts of sodium carbonate in 700 parts of Water. The bases are distilled off under reduced pressure at a bath temperature of 40-45 C. The precipitated base salt of the sulphuric acid ester is separated, and heated in a solution of 4 parts of sodium hydroxide in 250 parts of water and 190 parts of alcohol for 20 minutes at 40 C., while stirring. The solution is filtered and concentrated, and by the addition of sodium chloride there is obtained the sodium salt of the sulphuric acid ester of leuco-l-(4'-dimethylsulphonarnido benzoylamino) 4 (4" chlorobenzoylamino)-anthraquinone, in a yield of 76 percent.

EXAMPLE 13 25 parts of chlorosulphonic acid and subsequently 44.6 parts of diethyl-isopropylamine are introduced into parts of u-picoline, while cooling and stirring. After the addition of 10 parts of carbazolysed di-(5'-benzoylaminoi'-anthraquinonyl)-2:8-diaminochrysene (see the first paragraph of Example 7 of French specification No. 839,529) 5 parts of zinc are added in portions and the temperature is maintained at 30-33" C. When the dyestull has disappeared, the mixture is filtered to remove the excess of Zinc, and the reaction mixture is introduced into a solution of 45 parts of sodium carbonate in 600 parts of water. The bases are distilled off under reduced pressure at a bath temperature of 40-45" C. The precipitated base salt of the sulphuric acid ester is separated and heated in a solution of 8 parts of sodium hydroxide in 250 parts of Water and 100 parts of alcohol for 20 minutes at 50-55 C. The solution is filtered and concentrated, and by the addition of sodium chloride the sodium salt of the sulphuric acid ester of di-(5'-benzoylamino-1'-anthraquinonyl) -2 S-diaminochrysene is obtained in a yield of 87 percent.

By using instead of the above dyestuff, 10 parts of carbazolysed 8' 8"-dibenZoylamino-1 :4: 1' l"-trianthrimide (see Example 1 of French specification No. 861,921) the sulphuric acid ester salt is obtained in a yield of 80 percent.

EXAMPLE 14 The whole is heated at 5557 C. until the dyestuff disappears, which takes about 5 hours. The reaction mixture is introduced into a solution of 18 parts of sodium carbonate in 500 parts of water, and the bases are distilled off under reduced pressure at a bath temperature of 40-45 C. The precipitated base salt of the sulphuric acid ester is separated and stirred for 45 minutes in a solution of 4 parts of sodium hydroxide in parts of water and 50 parts of alcohol at 50-55 C.

The solution is filtered and concentrated, and by the addition of sodium chloride there is obtained the sodium salt of the sulphuric acid ester of 1-(5-benzoylamino-1'- anthraquinonyl)-2:S-diamindchrysene in a yield of 94 percent.

Further examples of starting materials and the results obtained therewith by the procedure described in the preceding examples are given in the following table:

Base of the formula d b S Pyri 1119 a B Yield, percent Eth yrn tmttsamgsiaasjj Metll'syl-diisc propylamine 0 o Diethyl-sec.-butylam Diethyl-3-amylaminedo 2-mothyl5-ethylpyridine. o a-picoline IV Diethyl-5-nnnylamine .do I

D') do Diethyl-isopropylamine, Did0 II ethyl-3-arnylamine, 1:1.

EXAMPLE 15 parts of chlorosulphonic acid are introduced into 80 parts of a-picoline while cooling and stirring. After the addition of 13 parts of iron powder the whole is heated for 30 minutes at l820 C. There are also added, while cooling, 25.5 parts of N-isopropyl-Z-methylpiperidine and subsequently 5 parts of 1:5-dibenzoylamino-anthraquinone. The whole is heated at 55-57 C. until the dyestutf disappears, which takes about 6 hours.

The reaction mixture is worked up as follows: It is introduced into a solution of 18 parts of sodium carbonate in 500 parts of water and the bases are distilled oft under reduced pressure at a bath temperature of 40-45 C. The precipitated base salt of the sulphuric acid ester is separated off, and heated in a solution of 4 parts of sodium hydroxide in 130 parts of water and 10 50 parts of alcohol for 30 minutes at 45-55 C. The solution is filtered and concentrated, and by the addition of sodium chloride the sodium salt of the sulphuric acid ester of leuco-l:5-dibenzoylaminoanthraquinone is obtained in a yield of 90 percent.

EXAMPLE 16 10 parts of chlorosulphonic acid are introduced dropwise into a mixture of 18 parts of a-picoline and 25.5 parts of N-isopropyl-Z-methylpiperidine, while cooling and stirring. S-parts of 1:4-dibenzoylaminoanthraquinone and 8 parts of brass powder are added, and the whole is heated at 50-55 C. until the dyestutf disappears, which takes about 3 hours. By working up as described in Example 15 there is obtained the sodium salt of the sulphuric acid ester of 1:4-dibenzoylaminoanthraquinone in a yield of 90 percent.

EXAMPLE 17 10 parts of chlorosulphonic acid are introduced into parts of a-picoline While cooling and stirring. After the addition of 8 parts of copper powder the whole is stirred for 30 minutes at 18-20" C. 30.5 parts of N4- heptyl-pyrrolidine and subsequently 5 parts of 1:4-dibenzoyl-aminoanthraquinone are added while cooling. The whole is heated to 40 C. until the dyestuffdisappears, which takes about /2 hour.

By working up as described in Example 15 there is obtained the sodium salt of the sulphuric acid ester of leuco-l:4-dibenzoylaminoanthraquinone in a yield of percent.

EXAMPLE 19 10 parts of chlorosulphonic acid and subsequently 30.5 parts of N-4-heptyl pyrrolidine are introduced into 80 parts of a-picoline while cooling and stirring. After the addition of 5 parts of carbazolised di-(5'-benzoylamino-l-anthraquinonyl)ester2:8-diaminochrysene, there are added in portions 3 parts of zinc powder at a temperature of 20-25" C. When the dyestuff has disap peared the excess of zinc is filtered off, and the filtrate is introduced into a solution of 18 parts of sodium carbonate in 500 parts of water. The bases are distilled oil under reduced pressure at a bath temperature of 40 45 C. The base salt of the sulphuric acid ester which precipitates is separated and worked up as described in Example 15. There is obtained the sodium salt of the sulphuric acid ester of leuco-(5-benzoylamino-l'-anthraquinonyU-Z:8-diaminochrysene in a yield of percent.

EXAMPLE 20 10 parts of chlorosulphonic acid are introduced into 207 parts of a-picoline, while cooling and stirring. After the addition of 8 parts of brass powder the whole is stirred for 20 minutes at 1820 C. and there are subsequently added, while cooling, 23 parts of N-isopropylpiperidine followed by 5 parts of l-(4-dirnethylsulphonamidobenzoylamino)-4-benzoylaminoanthraquinone, and the whole is heated at 4550 C. until the dyestufif disappears, which takes about one hour.

By working up as described in Example 15 there is obtained the sodium salt of the sulphuric acid ester of leuco (4-- dimethylsulphonamido benzoylamino) 4- benzoylamino-anthraquinone in a yield of 75 percent.

EXAMPLE 21 10 parts of chlorosulphonic acid are introduced into 80 parts of a-picoline, while cooling and stirring. After the addition of 8 parts of brass powder, the whole is stirred for 30 minutes at l820 C. 23 parts of N-isopropylpyridine and subsequently parts of the anthrimide of 1 :3-dichloro-2-methyl-anthraquinone and 1 :4-monobenzoyldiaminoanthraquinone are added while cooling. The whole is heated at 5 557 C. until the dyestuff disappears, which takes about 3 hours. By working up in accordance with Example 7 there is obtained from the reaction mixture the sodium salt of the sulphuric acid ester of the aforesaid anthrimide in a yield of 60 percent.

In the following table are given further tertiary amines and pyridine bases which may be used.

EXAMPLE 22 10 parts of chlorosulphonic acid are introduced into 80 parts of a-picoline while cooling and stirring. After the addition of 8 parts of brass powder the whole is heated for 20 minutes at -2 C. 30.3 parts of N-n-butyl2:6 dimethyl-piperidine and subsequently 5 parts of 1:5-dibenzoylaminoanthraquinone are added, while cooling. The whole is heated at 5557 C. until the dyestuff disappears, which takes about 3 hours. The reaction mixture is worked up as follows.

It is introduced into a solution of 18 parts of sodium carbonate in 500 parts of water and the bases are distilled off under reduced pressure at a bath temperature of 4045 C. The precipitated base salt of the sulphuric acid ester is separated and heated in a solution of 4 parts of sodium hydroxide in 130 parts of water and 50 parts of alcohol for 30 minutes at 50 C.

The solution is filtered and concentrated, and by the addition of sodium carbonate the sodium salt of the sulphuric acid ester of leuco-l:5-dibenzoylarninoanthraquinone is obtained in a yield of 89 percent.

EXAMPLE 23 10 parts of chlorosulphonic acid are introduced into a mixture of 103 parts of pyridine and 103 parts of ocpicoline, while cooling and stirring. After adding 8 parts of brass powder the whole is stirred for 30 minutes at 1820 C. 23 parts of N-methyl-2:6-dimethyl-piperidine followed by 5 parts of 1:4-dibenzoylaminoanthraquinone are added while cooling. The whole is heated at 40 C. until the dyestutf disappears, which takes about 30 minutes.

By working up according to Example 22 there is obtained. the sodium salt of the sulphuric acid ester of leuco-.1:4-dibenzoylaminoanthraquinone in a yield of 71 percent.

EXAMPLE 24 10 parts of chlorosulphonic acid are added dropwise to a mixture of 20.2 parts of u-picoline and 30.3 parts of N-nrbutylz:6-dirnethyl-piperidine, while cooling and stir! ring. 5 parts of l:4-dibenzoylaminoanthraquinone and 8 parts of brass powder are added and the whole is heated at 55-57 C. untilthe dyestufi disappears, which takes about 2 hours.

By working up according to Example 22 there is obtained the sodium salt of sulphuric acid ester of 1:4- dibenzoylaminoanthraquinone in a yield of 90 percent.

EXAMPLE 25 10 parts of chlorosulphonic acid are introduced into parts of u-picoline, while stirring and cooling. After the addition of 13 parts of iron powder, the whole is stirred for 30 minutes at l8-20 C. 25.2 parts of N-n-propyl-Z- methylpiperidine followed by 5 parts of carbazolised di- (5' benzoylamino 1' anthraquinonyl) 2:8 diaminochrysene are added while cooling. The whole is heated at 5557 C. until the dyestutf disappears, which takes about 5 hours.

By working according to Example 22 there is obtained the sodium salt of the sulphuric acid ester of di-(5- benzoylamino l anthraquinonyl) 2:8 diarninochrysene in a yield of over percent.

By using in this example, instead of the said dyestulf, 5 parts of 1:4-dibenzoylaminoanthraquinone or 5 parts of the anthrimide of l:3-dichloro-2-methyl-anthraquinone and 1:4-monobenzoyl-diarninoanthraquinone, the sodium salt of the sulphuric acid ester of leuco 1:4-dibenzoylamino anthraquinone or the leuco compound of the said anthrimide is obtained in a yield of 98 percent or 70 percent, respectively.

EXAMPLE 26 12.5 parts of N-ethyl-2:6-piperidine are introduced into 50 parts of a-picoline while stirring and cooling. After the addition of 5 parts of carbazolised 8:8"-dibenzoylamino-1:4-1':2-trianthrimide there are added in portions 3 parts of zinc powder and the whole is maintained at 30-33 C. When the dyestuff has disappeared, which takes about 2 hours, the excess of zinc is filtered off with suction and the reaction mixture is introduced into a solution of 22 parts of sodium carbonate in 500 parts of water. The bases are distilled oif under reduced pressure at a bath temperature of 40-45" C. The base salt of the sulphuric acid ester so precipitated is separated off. and heated in a solution of 4 parts of sodium hydroxide in parts of water and 50 parts of alcohol for one hour at 5055 C.

The solution is filtered and concentrated, and by the addition of sodium chloride the sodium salt of the sulphuric acid ester of leuco 8z8 dibenzoylamino- 1:4:1:1"-trianthrimide is obtained in a yield of 76 percent.

By using in this example 80 parts of oc-picoline, 10 parts of chlorosulphonic acid and, instead of N ethyl-2:6- dimethyl-piperidine, 28 parts of N-n-propyl-Z-methylpiperidine, the sodium salt of the sulphuric acid ester of leuco 8z8 dibenzoylamino 1:4: 1: 1" trianthrimide is obtained in a yield of 70 percent.

EXAMPLE 27 10 parts of chlorosulphonic acid are introduced dropwise into 80 parts of a-picoline. After the addition of 13 parts of iron powder, the whole is stirred for 30 minutes at 1820 C. 23 parts of N-ethyl2-rnethylpiperidine and subsequently 5 parts of 1-(4'-dimethylsulphonamido-benzoylamino -4-benzoylamino anthraquinone are added while cooling. The whole is heated at 55-57 C. until the dyestufl disappears, which takes about 3 hours By working up according to Example 22, there is obtained the sodium salt of the sulphuric acid ester of leuco l (4' dimethylsulphonamido-benzoylamino) 4- benzoylaminoanthraquinone in a yield of 85%.

Further examples of starting materials and the results obtained therewith are given in the following table:

Table III Base of the formula R1 R Vat Yield.

\ Pyridine Base dye- Metal percent N-CH stufi N-methytZfi-dlmethyl- Pyridine I Fe piperirline N-v thyl-i'l;methyla-pieoline II Cu 3 hiff Me 64 N-Ethyliflrfi-dimethyl- Cu 92 t iriiu i j. Me 87 Do Fe 74 N-n progyl-Zmethyb Co 67 313113 Fe 62 N-n'propyl-2-mcthyh a-picoline II Me 91 piperidine. N-n-hutyl- 2-methytpiperit1ine, N'Etlzlylfim-dlimethylipcri inc. 1: :1. N n Butyl-2z6-dimethylpyridine. 2:4- [I Me 90 piperidine. lutitlme. 2:6- I lutiiline. in ratio EXAMPLE 28 carbonate in 500 parts of water and the bases are distilled off under reduced pressure at a bath temperature of 4045" C. The precipitated ethyl-propyl-cyclohexylamine salt of the sulphuric acid ester is separated and heated in a solution'of 4 parts of sod'um hydroxide in 130 parts of water and 50 parts of alcohol for 30 minutes at 40 C. while stirring. The liberated base is distilled off under reduced pressure and by the addition of sodium chloride to the clarified solution the sodium salt of the sulphuric acid ester of leuco l-5-dibenzoy1- aminoanthraquinone is precipitated. The yield amounts to 89%.

EXAMPLE 29 p parts of chlorosulphohc acid are introduced into 80 parts of ct-picoline while cooling and stirring. After the addition of l3 parts of iron powder the whole is stirred for 30 minutes at 18-20" C. and then 30.5 parts of N-ethyl-isopropyl-cyclohexylamine followed by 5 parts of 1:4 dibenzoylaminoanthraquinone are added while cooling. The whole is heated at 50-55" C. until the dyestuffdisappears, which takes 2-3 hours.

By working up according to Example 28, there is obtained the sodium salt of thesulphuric acid ester of leuco-l:4-dibenzoylaminoanthraquinone in a yield of 90%. i

"By using in this example instead of N- ethyl-isopropylcyclohexylamine the same quantity of N-ethyl-n-propylcyclohex ylamine, there is obtained the sodium salt of the sulfuric acid ester of leuco-l:4-dibenzoylaminoanthraquinone in a yield of 89%.

EXAMPLE 3 0 33 parts of an isomeric mixture of N-ethyl-n-propyl- 2-methylcyclohexylamine followed by 10 parts of chlorosulphonic acid are added to 21.4 parts of a-picoline while cooling and stirring. 8 parts of brass powder and 5 parts of l:4-dibenzoylaminoahthraquinone are added and the whole is heated at 40-45 until the dyestuff disappears, which takes about 2 hours.

14 By working up according to Example 28, there is obtained the sodium salt of the sulphuric acid ester of leuco 124-dibenzoylaminoanthraquinone in a yield of 90%.

EXAMPLE 31 10 parts of chlorosulphonic acid are added to 297 parts of a-picoline while cooling and stirring. After the addition of 8 parts of brass powder the whole is stirred for 30 minutes at 1820 C. 30.6 parts of an isomeric mixture of N-methyl-n'propyH-methyl cyclohexylamine followed by 5 parts of 1-(4-dimethylsulphonamido-benzoylamino) 4 benzoylaminoanthraquinone are added while cooling and stirring, and the whole is heated at 40-45 C. until the dyestuif disappears, which takes about 1 hour.

By working up according to Example 28 the sodium salt of the sulphuric acid ester of leuco-1-(4'-dimethylsulphonamido benzoylamino) 4 benzoylaminoanthraquinone is obtained in a yield of over 70%.

EXAMPLE 32 10 parts of chlorosulphonc acid are introduced into 80 parts of rx-picoline while cooling and stirring. After the addition of 8 partsof brass powder the whole is heated for 20 m'nutes at 1820 C. 33 parts of an isomeric mixture of N-ethyl-isopropyl-4-methyl-cyclohexylamine followed by 5 parts of carbazolised di-(5-benzoylamino 1 anthraquinonyl) 2:8 diamino chrysene are added while cooling and stirring. The whole is heated at 75 until the dyestutf disappears, which takes about 3 hours. The reaction mixture is introduced into a solution of 18 parts of sodium carbonate in 500 parts of water and the bases are distilled off at a reduced pressure at a bath temperature of 4045 C. The precipitated base salt of the sulphuric acid ester is separated and stirred for 45 minutes in a solution of 4 parts of sodium hydroxide in 130 parts of water and 50 parts of alcohol at 50-55 C.

The solution is filtered and concentrated, and by adding sodium chloride the sodium salt of the sulphuric acid ester of di-(5-benzoylamino-1-anthr.aquinonyl-2:8-diamino chrysene is precipitated in a yield of 95%.

EXAMPLE 33 10 parts of chlorosulphonic acid followed by 37 parts of N-n-propyl-n-butyl-3-methyl-cyclohexylamine are introduced into 80 parts of ot-picoline While cooling and stirring. After the addition of 5 parts of carbazolised 8':8-dibcnzoy1arnino 1:4:1:1"-trianthrimide, 5 parts of zinc powder are added in portions and the temperature is maintained at 3033 C. When the dyestuff has dis appeared the excess of zinc is filtered off, and the filtrate is introduced into a solution of 18 parts of sodium carbonate in 500 parts of water. The bases are distilled off under reduced pressure at a bath temperature of 40 45 C. The base-salt of the sulphuric acid ester so precipitated is separated and heated in a solution of 4 parts of sodium hydroxide in 150 parts of water and 50 parts of alcohol at 50-55 C.

The solution is filtered and concentrated, and by the addition of sodium chloride, the sodium salt of the sulphuric acid ester salt of leuco8:8l"-benzoylamino- 1:4:1:1"-trianthrimide is obtained in a yield exceeding 55%. 1

EXAMPLE 34 10 parts of chlorosulphonic acid are introduced into partsof a-picoline while cooling and stirring. After the addition of 8 parts of brass powder the whole is as described in the first paragraph of Example 1 of French specification No. 857,987) are added while cool- 15 ing. The whole is heated at 55-57 C. until the dye- .stuff disappears, which takes 23 hours.

By working up according to Example 28 there is obtained from the reaction mixture the sodium salt of the 16 amino anthraquinone are added while cooling. The whole is heated until the dyestufi disappears, which takes aboutl hour.

By working up according to Example 35 there is ob- :sulphuric acid ester of the leuco compound of the anthri- 5 tained the sodium salt of the sulphuric acid ester of mide from 1:3-dichloro-Z-methyl-anthraquinone and 1:4- leuco-1:4.-dibenzoylamino anthraquinone in a yield monoberizoyl-diamino anthiaquinone in a yield of 78%. of 86%.

EXAMPLE 35 EXAMPLE 38 10 parts of chlorosulphonic acid are introduced into 10 t 10 pints of fchzlgrosulphcgmc 7 are i g s si 80 parts of tx-picoline while cooling and stirring. After a.m1xture 0 Paris 0 "P me 9 f 0 the addition of 7 parts of brass powder the Whole is N-dicyclohexyl:ethylamine, while cooling and stirring. stirred for 30 minutes at l820 C. and then 40.2 parts After addltlon i 8 parts of .brass powder 5 parts of Ndkyclohexyl n pmpy1amine followed by 5 parts of of 1:4-d1benzoylamino anthraquinone the whole .15 heated 1:5-dibenzoylamino anthraquirione are added while cool- 15 '2 umll the dyestufi disappears which takes ing. The whole is heated to 55-57" C. until the dyea out i stuff disappears which takes about 1 /2 hours. By Workmg up apcorcimg to Example 35 Sodmm The reaction Enixture is Worked up as follows salt of the sulphuric acid ester of leuco-114-dibenzoyl- It is introduced into a solution of 18 parts of sodium ammo amhraqumone 1S Obtamed m a yleld of carbonate in 500 parts of water, and the bases are par- 20 7 EXAMPLE 39 gglg js g g fg g gs f gg i g f gg iggg 10 parts of chloro-sulphonic acid are introduced irito out is removed from the salt solution and heated in a a mixture of 20 parts of i'P i 30 Paris of Solution of 4 parts of Sodium hydroxide in 130 parts of and 30 parts o f 2:6-lut1dine while cooling and stirring. Water and 49 parts of alcohol for 30 minutes at c 2 After the addition of 8 parts of brass powder, the whole a o By extracting the filtered solution with benzene the bases sun-fad for at 18 20 and then parts are removed and by the addition of sodium chloride the of an lsonilenc mlxture of l f l sodium salt of the sulphuric acid ester of leuco-1:5-di gfi lz ggi g zggygi g j qi 63;1 :2 23 benzoylamino-anthraquinone is precipitated in a yield P h y d y of 90% aminol-ant raqumone are a de W ie coo ing. The EXAMPLE 36 whole is heated at 4045 C. until the dyestufi disappears, which takes about 2 hours. 10 parts of chlorosulphonic acid are introduced into By Working up according to Example the Sodium 356 533228; 35 2 5 5232 iggl goiy ej g a 3 salt of the sulphuric acid ester of leuco-l-(4'-dimethyl L u stirred for 20 minutes at l820 C. and then 37.6 parts 35 z gg; i g g? igig E gagi g: ig gr gfifiy of N-cyclohexyl-3-methyl-cyclohexyl methylamine followed by 5 parts of 1:4-dibenzoylamino anthraquinone EXAMPLE 40 are added While cooling. The whole is heated at-40- o r paits of chlorosulphonic acid are introduced into 2% the dyesmfi dlsappeas Whlch takes about 80 parts of pyridine while cooling and stirring. After B y iri oi 'i ing up accordin to Example 35 the sodium 40 gi g b 8 parts i gf powderhthe M21018 is a stiri-e or minutes at and t en 40. parts g i' gg g sgg i ig g 'gb of N-dicyclohexyl-n-propylamine followed by 5 partsof an q 1 01 S y carbazolised di-(5'-benzoylamino-1-anthraquinonyl)-2:8-

EXAMPLE 37 diamino-chrysene are added while cooling. The Whole 10 parts of chlorosulphonic acid are introduced into 4 is heated to 57 C. until the dyestufi disappears, which parts of a-picoline while cooling and stirring. After takes about 5 hours. the addition of 13 parts of iron powder the whole is By Working up according to Example 35, except that stirred for 30 minutes at 18*20" C., and then 45.2 parts by splitting up the base salt of the sulphuric acid ester of an isomeric mixture of N-cyclohexyll-methyl cyclowith dilute caustic soda solution the temperature is raised hexyl-n-butylamine followed by 5 parts of 1:4-dibenzoyl- 50 to 5055 0, there is obtained the sodium salt of the Table IV r. Vat Yield, Base of the formula N-CH X Pyridine base dye- Metal percent R \v' SLLlfl:

N-methyl-ethyl-cyclnhexylamirie. a-pieoline III (u i 83 N-methyl-n-propylcychhexylamine .do 11 Fe 78 N-methyl-n-prnpyl-3-methyleyclohexylaminenn .dn I 00 5g N-rncthyl-is"pr pyl-cycl"hexylamlne Pyridine... I Me 88 N-methyl-ls' propyl-2 methylcyclohexylamln 2:4-lutidlne, lutidine,l II Me 93 N-methyl-isopropyl-3-methylcyel0hexylamine. a-pieoli'nefl-picnline,-y-picoline, II Me Netigyl-ls0propyl--methylcyclohexylamlne. fi-pi i: lihe, y-pienline, 1:1 I} Me 71 me I N-dim pr pylQ-IUQthyl-cydo-hexylamine .i dn Hi N'n-pr"pyl-is pr' pyl-eyclohexyl-arnine .a-plcflll l'lfl 11 Fe N-ngropyl-n-butyl-3-methy1-cyclohexylamine .do f

V N-n-butyl-is"pr"pyl-cycloheXyl-amlne II M 3; N methyl is pr pyl 2 methyl eyclohexyl II Me 93 amine. N methyl n propyl 3 methyl cyel hexylamine. N ethyl n propyl 3 methyl cyclohexylamine, 111:1. Y N-dilgyelohexyl-methylamine 91 I) A N-dilgyclohexyl-ethylamine gig 0 4 N-di'cyclohexyl-n-propylamine. F: a: tr :2. N-c eidiiiiyi -riieihyiyidfixfifi f ib'yiafifiiii a-plcoline Zn 60 EXAMPLE 41 10 parts of chlorosulphonic acid, and then 40.2 parts of N-dicyclohexyl-n-propylamine are introduced into 80 parts of a-picoline, while cooling and stirring. After the addition of parts of carbazolised 8':8"-dibenzoylamino- 1:4: 1: 1"-trianthrimide 3 parts of zinc powder are added in portions and the temperature is maintained at 30-35 C. When the dyestuif has disappeared the excess of zinc is filtered off and the filtrate is introduced into a solution of 18 parts of sodium carbonate in 500 parts of water. The bases are distilled 01f under reduced pressure at a bath temperature of 40-45 C. The base salt of the sulphuric acid ester thus precipitated is separated, and heated in a solution of 4 parts of sodium hydroxide in 150 parts of water and 50 parts of alcohol at 50-55 C. After extracting the solution with benzene, there is obtained therefrom by the addition of sodium chloride the sodium salt of the sulphuric acid ester of 8: "-dibenzoylamino-1:41:1"-trianthrimide in a yield of 60%.

EXAMPLE 42 10 parts of chlorosulphonic acid are introduced into 80 parts of pyridine, while cooling and stirring. After the addition of 13 parts of iron powder, the whole is stirred for 30 minutes at 18-20 C. and then, while cooling, 28 parts of cyclopentyl-piperidine followed by 5 parts of 1:5-dibenzoylarninoanthraquinone are added. The whole is heated at 55-57 C. until the dyestufi disappears, which takes 1 /fi-2 hours.

The reaction mixture is worked up as follows: It is introduced into a solution of 18 parts of sodium carbonate in 500 parts of water, and the bases are distilled 05 under reduced pressure at a bath temperature of 4045" C. The precipitated N-cyclopentyl-piperidine salt of the sulphuric acid ester is separated, and then heated in a. solution of 4 parts of sodium hydroxide in 130 parts of water and 50 parts ,of alcohol for about /2 hour at 40-50 C. The base liberated is distilled off under reduced pressure, the solution is filtered to remove insoluble matter, the filtrate is then rendered slightly acid with dilute hydrochloric acid, filtered, rendered alkaline with dilute caustic soda solution, and by the addition of sodium chloride the sodium salt of the sul- 'phuric acid ester of 1:5-dibenzoylaminoanthraquinone is obtained in a yield of 73%.

EXAMPLE 43 10 parts of chlorosulphonic acid are introduced, while cooling and stirring, into a mixture of 20.1 parts of a-picoline and 30.2 parts of N-cyclopeutyl-Z-methylpiperidine. 5 parts of 1:4-dibenzoylaminoanthraquinone and 8 parts of brass powder are added, and the whole is heated at 55-57 C. until the dyestufi disappears, which the precipitated base is removed by extraction with benzene or ether, and by the addition of sodium chloride the sodium salt of the sulphuric acid ester of 1:4-dibenzoylaminoanthraquinone is precipitated in a yield of 92%.

EXAMPLE 44 ;.the.'addition of Spams of brass powder, the whole is EXAMPLE 45 10 parts of chlorosulphonic acid are introduced into parts of a-picoline while cooling and. stirring After the addition of 8 parts of brass powder, the wholeis stirred at 18-20 C. for 30 minutes. There are then added, while cooling, 27.8 parts of n-cyclohexyl-pyrrolidine followed by 5 parts of carbazolised di-(S-benzdylamino-1'-anthraquinonyl) 2:8 diaminochrysene. The whole is heated at 50 C. until the dyestufidisappears, which takes about 3 hours. -.-;w-

By working up according to Example 43, except that the base salt of the sulphuric acid ester is heated at 50- 55 C. in an aqueous alcoholic solution of caustic soda, the sodium salt of the sulphuric acid ester of "the leuco compound of carbazolised di-(5-benzoylamino 1'-anthraquinonyl)-2:8-diaminochrysene is obtained in a yield of r f EXAMPLE 46 By working up according to Example 43 thereisTobtained. the sodium salt of the sulphuric acid ester 'of: leuco- 1-(4-dimethylsulphonamido-benzoylamino) 4 .-.benzoylaminoanthraquinone in a yield of 83%.

EXAMPLE 47 10 parts of chlorosulphonic acid are introduced into 80 parts of a-picoline while stirring and cooling. ;After the addition of 8-parts of brass powder the-wholeuis stirred for 30 minutes at 18-20? C. There are then added, while cooling, 30.2 parts of N-cyclopentyl-Z- methylpiperidine followed by 5 parts of carbazolysed 8':8-dibenzoylamino-l:4-1:1"-trianthrimid e, and the whole is heated at 50 C. until the dyestuff disappears, which takes 5-6 hours. v

By working up according to Example 45, the sodium salt of the sulphuric acid ester of the leucocompound of carbazolised 8':8"-dibenzoylamino-1:4-1: l"-trianthrimide is obtained inayield of 67%.

EXAMPLE 4:;

10 parts of chlorosulphonic acid are intriduced into 80 parts of a-picoline while cooling and stirring. After obtained the sodium salt of the sulphuricacid ester of the leuco compound of the anthrimide obtained from 1:3-

dichloro-Z-methylanthraquinone and 1:4-monobenzoyldiaminoanthraquinone in a yield of 90%.

Table V i {"K Vat Yield, .,-,]3ase oi theformula X N-CH Y Pyridine base Dye- Metal percent ,xe stutt N-cyclopentyl-2-methylpiper l a-p e I Zn 74 o do II Zn 93 N-cyclohexyl-piperidinn 2z4-lu e 11 Me 84 D a-picnlin VI Zn 65 D pyridine, a-picoline, fl-picollne, II Mo 83 2-methyl-5-ethylpyr1dine in the ratio l:1:l:1. N-4-methylcyclohexylplperl in a-picolirw II 78 N-3-methylcyclohexyl-2-methyl-piperidine dn II Me 92 N-.4'-methylcyclohexyl-2-n19thyl-pip9ridine (ln III Me 88 N-cyclohexyl-pyrrnlidine do II Fe 79 N-B-methyloyclohexyl-pyrroli ne III Fe 59 :N-4-methylcyclohexyl pyrrnli d inn (1 n II Me 85 ,:\The present-application is in part a continuation of copending application Serial No. 357,894, filed May 27, ,1953, which is itself-a continuation in part of patent application SerialNo. 319,174, filed November 6, 1952, .which also isitselt a continuationin part of patent application Serial' No. 212,834 of February 26, 1951 (now severally abandoned).

What we claim is: v i v "'1. ,A process for the manufacture of a water-soluble 'saltof a sulphuric acid ester of a leuco vat dyestufi of the anthraquinone series, which dyestuff gives an ester yield of less than 25% relative to the weight thereof when esterified by means of a mixture of pyridine base and 'chlorosulphonic acid (:1 by weight) in the presence of a metal powder, comprising reacting the vat dyestuffs in the, presence of at least one finely divided metal, selected from the group consisting of iron, cobalt, :zinc; copper and copper alloys witha member of the group consisting ,of chlorosulphonic acid andan equiv- .alentimixture of sulphur trioxide and hydrogen chloride in the presence of a .mixture consisting of at least one pyridine base selected from the group consisting of pyridine, zx-, ,8- and 'y-picoline, 2:4- and 2:6- lutidine, 2*methyl-5-ethyl-pyridine, 'and of atleast one tertiary amine of .the general formula- NCl 1 in which all the four free valences are occupied by carborratoms of radicals selected from the group consisting of monovalent saturated hydrocarbon radicals f'each occupying any one of the said-free valences and of "divalent saturated hydrocarbon radicals having twoend "carbon atoms occupying any one pair of the said free -valences, any of the said monovalent and divalent satu- "=-rated hydrocarbon radicals which-are bound solely-to the nitrogen-atom each containing at most seven carbon atoms and any two monovalent radicals so bound containing together atleast three and at most ele ven carbon -ator'ns, any of the said molovalent and divalent-saturated "hydrocarbon radicals which are bound solely to the carbon atom of theformulaeach containing at most six carbon atoms and any two monovalent radicals so bound containing together at least two and at most eight carbon atoms, the said pyridine base-tertiary amine mixture conjtaining 10-60 percent by weight of tertiary amine comlponent, and subsequently converting the resulting sulphlu'ric acid ester compound into a water-soluble ester 'sa t.

, 2.A process for the manufacture of a water-soluble salt of a sulphuric acid ester of a leuco vat dyestufi of the anthraquinone series, which dyestutf gives an ester 'yield of less than 25% relative to the Weight thereof when esterified by means of a mixture of pyridine base rand chlo'rosulpho nic acid (10:1 by weight) in the presence of a metal powder, comprising reacting the vat dyestufis in the presence of at least one finely divided metal, selected from the group consisting of iron, cobalt, zinc, copper and copper alloys with a member ot the group consisting of chlorosulphonic acid and an equivalent mixture of sulphur trioxide and hydrogen chloride in the presence of .a mixture consisting of at least one pyridine base selected from the group consisting of pyridine, w, B- and y-picoline, 2:4- and 2:6-lutidine, 2-methyl-5-ethylpyridine, and of at least one tertiary amine of the general formula in which all the four free valences are occupied by carbon atoms of radicals selected from the group consisting of monovalent saturated hydrocarbon radicals each occupying any one of the said free valences and of divalent saturated hydrocarbon radicals having two end carbon atoms occupying any one pair of the said free valences, any of the said monovalent and divalent saturated hydrocarbon radicals which are bound solely to the nitrogen atom each containing at most seven carbon atoms and any two monovalent radicals so bound containing together at least three and at most eleven carbon atoms, any of the said monovalent and divalent saturated hydrocarbon radicals which are bound solely to the carbon atom of the formula each containing at most six carbon atoms and any two monovalent radicals so bound containing together at least two and at most eight carbon atoms, the said pyridine base-tertiary amine mixture containing 15-35 percent by weight of tertiary amine component, and subsequently converting the resulting sulphuric acid ester compound into a water ester salt.

3. A process for the manufacture of a water-soluble salt of a sulphuric acid ester of a leuco vat dyestuft of the anthraquinone series, which dyestuff gives an ester yield of less than 25% relative to the weight thereof when esterifie'd by means of a mixture of pyridine base and chlorosulphonic acid (10:1 by weight) in the presence of a metal powder, comprising reacting the vat dyestutfs in the presence of at least one finely divided metal, selected from the group consisting of iron, cobalt, zinc, copper and copper alloys witha member of the group consisting of chlorosulphonic .acid and an equivalent mixture of sulphur trioxide and hydrogen chloride in the presence of a mixture consisting of at least one pyridine base selected from the group consisting of pyridine, w, 8- and y-picoline, 2:4- and 2:6-lutidine, 2- rnethyl-S-ethyl-pyridine, and of at least one tertiary amine of the general formula ,arnine mixture containing 10-60 percent by weight of tertiary amine component, and subsequently converting the resulting sulphuric acid ester compound into a watersoluble ester salt.

4. A process for the manufacture of a water-soluble salt of a sulphuric acid ester of a leuco vat dyestulf of the anthraquinone series, which dyestuff gives an ester yield of less than 25% relative to the weight thereof when esterified by means of a mixture of pyridine base and chlorosulphonic acid (:1 by weight) in the presence of a metal powder, comprising reacting the vat dyestuffs in the presence of at least one finely divided metal, selected from the group consisting of iron, cobalt, zinc, copper and copper alloys with a member of the group consisting of chlorosulphonic acid and an equivalent mixture of sulphur trioxide and hydrogen chloride in the presence of a mixture consisting of at least one pyridine base selected from the group consisting of pyridine, a-, 8- and 'y-picoline, 2:4- and 2:6-lutidine, 2-methyl-5-ethylpyridine, and of at least one tertiary amine of the general formula in which X stands for a member selected from the group consisting of unsubstituted and methyl-substituted pentamethylene and tetramethylene radicals and each R and R stands for a member selected from the group consisting of methyl, ethyl, propyl and butyl radicals, the said pyridine base-tertiary amine mixture containing 10-60 percent by weight of tertiary amine component, and subsequently converting the resulting sulphuric acid ester compound into a water-soluble ester salt.

5. A process for the manufacture of a water-soluble salt of a sulphuric acid ester of a leuco vat dyestufi of the anthraquinone series, which dyestufi gives an ester yield of less than 25% relative to the weight thereof when esterified by means of a mixture of pyridine base and chlorosulphonic acid (10:1 by weight) in the presence of a metal powder, comprising reacting the vat dyestutf in the presence of at least one finely divided metal, selected from the group consisting of iron, cobalt, zinc, copper and copper alloys with a member of the group consisting of chlorosulphonic acid and an equivalent mixture of sulphur trioxide and hydrogen chloride in the presence of a mixture consisting of at least one pyridine base selected from the group consisting of pyridine, a-, 3- and 'y-picoline, 2:4- and 2:6-lutidine, 2-methyl-5-ethyl pyridine, and of at least one tertiary amine of the general formula in which R stands for a member selected from the group consisting of methyl, ethyl, propyl and butyl radicals, R stands for a methyl group and X stands for a member selected from the group consisting of unsubstituted and methyl-substituted tetramethylene radicals, the said pyridine base-tertiary amine mixture constaining 10-60 percent by weight of tertiary amine component, and subsequently converting the resulting sulphuric acid ester compound into a water-soluble ester salt.

6. A process for the manufacture of a water-soluble salt of a sulphuric acid ester of a leuco vat dyestufi' of the anthraquinone series, which dyestufi gives an ester yield of less than 25% relative to the weight thereof when esterified by means or a mixture of pyridine base and chlorosulphonic acid (10:1 by weight) in the presence of a metal powder, comprising reacting the vat dyestuff in the presence of at least one finely divided metal, selected from the group consisting of iron, cobalt, zinc, copper and copper alloys with a member of the group consisting of chlorosulphonic acid and an equivalent mixture of sulphur trioxide and hydrogen chloride in the presence of a mixture consisting of at least one pyridine base selected from the group consisting of pyridine, 11-, B- and y-picoline, 2:4- and 2:6lutidine, 2-methyl-5-ethylpyridine, and of at least one tertiary amine of the general formula in which X stands for a member selected from the group consisting of unsubstituted and methyl-substituted pentamethylene radicals, R stands for a member selected from the group consisting of methyl, ethyl, propyl and butyl radicals and R stands for a member selected from the group consisting of ethyl, propyl, isopropyl, butyl and cyclohexyl radicals, the said pyridine base-tertiary amine mixture containing 10-60 percent by weight of tertiary amine component, and subsequently converting the resulting sulphuric acid ester compound into a watersoluble ester salt.

7. A process for the manufacture of a water-soluble salt of a sulphuric acid ester of a leuoo vat dyestufi of the anthraquinone series, which dyestuff gives an ester yield of less than 25% relative to the weight thereof when esterified by means of a mixture of pyridine base and chlorosulphonic acid (10:1 by weight) .in the presence of a metal powder, comprising reacting the vat dyestuffs in the presence of at least one finely divided metal, se lected from the group consisting of iron, cobalt, zinc, copper and copper alloys with a member of the group consisting of chlorosulphonic acid and an equivalent mixture of sulphur trioxide and hydrogen chloride in the presence of a mixture consisting of at least one pyridine base selected from the group consisting of pyridine, a-, {3- and -picoline, 2:4- and 2:6-lutidine, Z-methyl-S-ethylpyridine, and of at least one tertiary amine of the genin which each X and Y stands for a member selected from the group consisting of unsubstituted and methylsubstituted pentamethylene and tetramethylene radicals, the said pyridine base-tertiary amine mixture containing 10-60 percent by weight of tertiary amine component, and subsequently converting the resulting sulphuric acid ester compound into a water-soluble ester salt.

References Cited in the file of this patent UNITED STATES PATENTS 2,563,819 Coffey et al Aug. 14, 1951 2,705,717 Oppliger Apr. 5, 1955 2,784,198 Peyer Mar. 5, 1957 2,803,630 Oppliger Aug. 20, 1957 FOREIGN PATENTS 315,597 Switzerland Aug. 31, 1956 

1. A PROCESS FOR THE MANUFACTURE OF A WATER-SOLUBLE SALT OF A SULPHURIC ACID ESTER OF A LEUCO VAT DYESTUFF OF THE ANTHRAQUINONE SERIES, WHICH DYESTUFF GIVES AN ESTER YIELD OF LESS THAN 25% RELATIVE TO THE WEIGHT THEREOF WHEN ESTERIFIED BY MEANS OF A MIXTURE OF PYRIDINE BASE AND CHLOROSULPHONIC ACID (10:1 BY WEIGHT) IN THE PRESENCE OF A METAL POWDER, COMPRISING REACTING THE VAT DYESTUFFS IN THE PRESENCE OF AT LEAST ONE FINELY DIVIDED METAL, SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT, ZINC, COPPER AND COPPER ALLOYS WITH A MEMBER OF THE GROUP CONSISTING OF CHLOROSULPHONIC ACID AND AN EQUIVALENT MIXTURE OF SULPHUR TRIOXIDE AND HYDROGEN CHLORIDE IN THE PRESENCE OF A MIXTURE CONSISTING OF AT LEAST ONE PYRIDINE BASE SELECTED FROM THE GROUP CONSISTING OF PYRIDINE, A-, B- AND Y-PICOLINE, 2:4- AND 2:6-LUTIDINE, 2-METHYL-5-ETHYL-PYRIDINE, AND OF AT LEAST ONE TERTIARY AMINE OF THE GENERAL FORMULA 